Feature/schemacompare cancel (#6104)

* Schema compare cancel changes for ADS

* adding a missed change

* Merge from Master

* Updating SqltoolsService version

* trying stress with bigger runtime

* trying one more stress fix with unique operation ids

* refactoring test a bit to ensure stress run works

extensions/integration-tests/src/schemaCompare.test.ts

@@ -12,12 +12,14 @@ const path = require('path');
 import { context } from './testContext';
 import assert = require('assert');
 import { getStandaloneServer } from './testConfig';
+import { stressify } from 'adstest';
 
 let schemaCompareService: azdata.SchemaCompareServicesProvider;
+let schemaCompareTester: SchemaCompareTester;
 let dacpac1: string = path.join(__dirname, 'testData/Database1.dacpac');
 let dacpac2: string = path.join(__dirname, 'testData/Database2.dacpac');
-let dummyDBName: string = 'ads_schemaCompareDB'; // This is used as fill in name and not created anywhere
 const SERVER_CONNECTION_TIMEOUT: number = 3000;
+const retryCount = 24; // 2 minutes
 
 if (context.RunTest) {
 	suite('Schema compare integration test suite', () => {
@@ -31,10 +33,29 @@ if (context.RunTest) {
 				attempts--;
 				await utils.sleep(1000); // To ensure the providers are registered.
 			}
+			schemaCompareTester = new SchemaCompareTester();
 			console.log(`Start schema compare tests`);
 		});
 		test('Schema compare dacpac to dacpac comparison', async function () {
+			await schemaCompareTester.SchemaCompareDacpacToDacpac();
+		});
+		test('Schema compare database to database comparison and script generation', async function () {
+			await schemaCompareTester.SchemaCompareDatabaseToDatabase();
+		});
+		test('Schema compare dacpac to database comparison and script generation', async function () {
+			await schemaCompareTester.SchemaCompareDacpacToDatabase();
+		});
+	});
+}
+
+class SchemaCompareTester {
+	private static ParallelCount = 1;
+
+	@stressify({ dop: SchemaCompareTester.ParallelCount })
+	async SchemaCompareDacpacToDacpac(): Promise<void> {
 		assert(schemaCompareService, 'Schema Compare Service Provider is not available');
+		const now = new Date();
+		const operationId = 'testOperationId_' + now.getTime().toString();
 
 		let source: azdata.SchemaCompareEndpointInfo = {
 			endpointType: azdata.SchemaCompareEndpointType.Dacpac,
@@ -53,12 +74,12 @@ if (context.RunTest) {
 			ownerUri: '',
 		};
 
-			let schemaCompareResult = await schemaCompareService.schemaCompare(source, target, azdata.TaskExecutionMode.execute, null);
+		let schemaCompareResult = await schemaCompareService.schemaCompare(operationId, source, target, azdata.TaskExecutionMode.execute, null);
-			assertSchemaCompareResult(schemaCompareResult);
+		this.assertSchemaCompareResult(schemaCompareResult, operationId);
-		});
+	}
-
-		test('Schema compare database to database comparison and script generation', async function () {
 
+	@stressify({ dop: SchemaCompareTester.ParallelCount })
+	async SchemaCompareDatabaseToDatabase(): Promise<void> {
 		let server = await getStandaloneServer();
 		await utils.connectToServer(server, SERVER_CONNECTION_TIMEOUT);
 
@@ -68,11 +89,12 @@ if (context.RunTest) {
 		let index = nodes.findIndex(node => node.nodePath.includes(server.serverName));
 		assert(index !== -1, `Failed to find server: "${server.serverName}" in OE tree`);
 
-			let ownerUri = await azdata.connection.getUriForConnection(nodes[index].connectionId);
+		const ownerUri = await azdata.connection.getUriForConnection(nodes[index].connectionId);
-			let now = new Date();
+		const now = new Date();
 
-			let sourceDB: string = 'ads_schemaCompare_sourceDB_' + now.getTime().toString();
+		const operationId = 'testOperationId_' + now.getTime().toString();
-			let targetDB: string = 'ads_schemaCompare_targetDB_' + now.getTime().toString();
+		const sourceDB: string = 'ads_schemaCompare_sourceDB_' + now.getTime().toString();
+		const targetDB: string = 'ads_schemaCompare_targetDB_' + now.getTime().toString();
 
 		try {
 			let dacfxService = await azdata.dataprotocol.getProvider<azdata.DacFxServicesProvider>('MSSQL', azdata.DataProviderType.DacFxServicesProvider);
@@ -82,6 +104,8 @@ if (context.RunTest) {
 
 			assert(result1.success === true, 'Deploy source database should succeed');
 			assert(result2.success === true, 'Deploy target database should succeed');
+			utils.assertDatabaseCreationResult(sourceDB, ownerUri, retryCount);
+			utils.assertDatabaseCreationResult(targetDB, ownerUri, retryCount);
 
 			assert(schemaCompareService, 'Schema Compare Service Provider is not available');
 
@@ -102,22 +126,23 @@ if (context.RunTest) {
 				ownerUri: ownerUri,
 			};
 
-				let schemaCompareResult = await schemaCompareService.schemaCompare(source, target, azdata.TaskExecutionMode.execute, null);
+			let schemaCompareResult = await schemaCompareService.schemaCompare(operationId, source, target, azdata.TaskExecutionMode.execute, null);
-				assertSchemaCompareResult(schemaCompareResult);
+			this.assertSchemaCompareResult(schemaCompareResult, operationId);
 
-				let status = await schemaCompareService.schemaCompareGenerateScript(schemaCompareResult.operationId, server.serverName, dummyDBName, azdata.TaskExecutionMode.script);
+			let status = await schemaCompareService.schemaCompareGenerateScript(schemaCompareResult.operationId, server.serverName, targetDB, azdata.TaskExecutionMode.script);
 
 			// TODO : add wait for tasks to complete
 			// script generation might take too long and the 'success' status does not mean that script is created.
-				await assertScriptGenerationResult(status);
+			await this.assertScriptGenerationResult(status, target.serverName, target.databaseName);
 		}
 		finally {
 			await utils.deleteDB(sourceDB, ownerUri);
 			await utils.deleteDB(targetDB, ownerUri);
 		}
-		});
+	}
 
-		test('Schema compare dacpac to database comparison and script generation', async function () {
+	@stressify({ dop: SchemaCompareTester.ParallelCount })
+	async SchemaCompareDacpacToDatabase(): Promise<void> {
 		let server = await getStandaloneServer();
 		await utils.connectToServer(server, SERVER_CONNECTION_TIMEOUT);
 
@@ -127,9 +152,10 @@ if (context.RunTest) {
 		let index = nodes.findIndex(node => node.nodePath.includes(server.serverName));
 		assert(index !== -1, `Failed to find server: "${server.serverName}" in OE tree`);
 
-			let ownerUri = await azdata.connection.getUriForConnection(nodes[index].connectionId);
+		const ownerUri = await azdata.connection.getUriForConnection(nodes[index].connectionId);
-			let now = new Date();
+		const now = new Date();
-			let targetDB: string = 'ads_schemaCompare_targetDB_' + now.getTime().toString();
+		const operationId = 'testOperationId_' + now.getTime().toString();
+		const targetDB: string = 'ads_schemaCompare_targetDB_' + now.getTime().toString();
 
 		try {
 			let dacfxService = await azdata.dataprotocol.getProvider<azdata.DacFxServicesProvider>('MSSQL', azdata.DataProviderType.DacFxServicesProvider);
@@ -156,27 +182,38 @@ if (context.RunTest) {
 			};
 
 			assert(schemaCompareService, 'Schema Compare Service Provider is not available');
-				let schemaCompareResult = await schemaCompareService.schemaCompare(source, target, azdata.TaskExecutionMode.execute, null);
-				assertSchemaCompareResult(schemaCompareResult);
 
-				let status = await schemaCompareService.schemaCompareGenerateScript(schemaCompareResult.operationId, server.serverName, dummyDBName, azdata.TaskExecutionMode.script);
+			let schemaCompareResult = await schemaCompareService.schemaCompare(operationId, source, target, azdata.TaskExecutionMode.execute, null);
-				await assertScriptGenerationResult(status);
+			this.assertSchemaCompareResult(schemaCompareResult, operationId);
+
+			let status = await schemaCompareService.schemaCompareGenerateScript(schemaCompareResult.operationId, server.serverName, targetDB, azdata.TaskExecutionMode.script);
+			await this.assertScriptGenerationResult(status, target.serverName, target.databaseName);
 		}
 		finally {
 			await utils.deleteDB(targetDB, ownerUri);
 		}
-		});
+	}
-	});
-}
 
-export function assertSchemaCompareResult(schemaCompareResult: azdata.SchemaCompareResult): void {
+	private assertSchemaCompareResult(schemaCompareResult: azdata.SchemaCompareResult, operationId : string): void {
 		assert(schemaCompareResult.areEqual === false, `Expected: the schemas are not to be equal Actual: Equal`);
 		assert(schemaCompareResult.errorMessage === null, `Expected: there should be no error. Actual Error message: "${schemaCompareResult.errorMessage}"`);
 		assert(schemaCompareResult.success === true, `Expected: success in schema compare, Actual: Failure`);
 		assert(schemaCompareResult.differences.length === 4, `Expected: 4 differences. Actual differences: "${schemaCompareResult.differences.length}"`);
-}
+		assert(schemaCompareResult.operationId === operationId, `Operation Id Expected to be same as passed. Expected : ${operationId}, Actual ${schemaCompareResult.operationId}`)
+	}
 
-export async function assertScriptGenerationResult(resultstatus: azdata.ResultStatus): Promise<void> {
+	private async assertScriptGenerationResult(resultstatus: azdata.ResultStatus, server: string, database: string): Promise<void> {
 		// TODO add more validation
 		assert(resultstatus.success === true, `Expected: success true Actual: "${resultstatus.success}" Error Message: "${resultstatus.errorMessage}`);
+		const taskService = await azdata.dataprotocol.getProvider<azdata.TaskServicesProvider>('MSSQL', azdata.DataProviderType.TaskServicesProvider);
+		const tasks = await taskService.getAllTasks({ listActiveTasksOnly: true });
+		let foundTask: azdata.TaskInfo;
+		tasks.tasks.forEach(t => {
+			if (t.serverName === server && t.databaseName === database && t.taskExecutionMode === azdata.TaskExecutionMode.script) {
+				foundTask = t;
+			}
+		});
+		assert(foundTask, 'Could not find Script task');
+		assert(foundTask.isCancelable, 'The task should be cancellable');
+	}
 }

extensions/mssql/src/config.json

@@ -1,6 +1,6 @@
 {
 	"downloadUrl": "https://github.com/Microsoft/sqltoolsservice/releases/download/v{#version#}/microsoft.sqltools.servicelayer-{#fileName#}",
-	"version": "1.5.0-alpha.100",
+	"version": "1.5.0-alpha.103",
 	"downloadFileNames": {
 		"Windows_86": "win-x86-netcoreapp2.2.zip",
 		"Windows_64": "win-x64-netcoreapp2.2.zip",

extensions/mssql/src/contracts.ts

@@ -435,6 +435,7 @@ export namespace RemoveServerGroupRequest {
 
 // ------------------------------- <Schema Compare> -----------------------------
 export interface SchemaCompareParams {
+	operationId: string;
 	sourceEndpointInfo: azdata.SchemaCompareEndpointInfo;
 	targetEndpointInfo: azdata.SchemaCompareEndpointInfo;
 	taskExecutionMode: TaskExecutionMode;
@@ -466,6 +467,10 @@ export interface SchemaCompareNodeParams {
 	taskExecutionMode: TaskExecutionMode;
 }
 
+export interface SchemaCompareCancelParams {
+	operationId: string;
+}
+
 export namespace SchemaCompareRequest {
 	export const type = new RequestType<SchemaCompareParams, azdata.SchemaCompareResult, void, void>('schemaCompare/compare');
 }
@@ -486,4 +491,8 @@ export namespace SchemaCompareIncludeExcludeNodeRequest {
 	export const type = new RequestType<SchemaCompareNodeParams, azdata.ResultStatus, void, void>('schemaCompare/includeExcludeNode');
 }
 
+export namespace SchemaCompareCancellationRequest {
+	export const type = new RequestType<SchemaCompareCancelParams, azdata.ResultStatus, void, void>('schemaCompare/cancel');
+}
+
 // ------------------------------- <Schema Compare> -----------------------------

extensions/mssql/src/features.ts

@@ -167,8 +167,8 @@ export class SchemaCompareServicesFeature extends SqlOpsFeature<undefined> {
 	protected registerProvider(options: undefined): Disposable {
 		const client = this._client;
 
-		let schemaCompare = (sourceEndpointInfo: azdata.SchemaCompareEndpointInfo, targetEndpointInfo: azdata.SchemaCompareEndpointInfo, taskExecutionMode: azdata.TaskExecutionMode, deploymentOptions: azdata.DeploymentOptions): Thenable<azdata.SchemaCompareResult> => {
+		let schemaCompare = (operationId: string, sourceEndpointInfo: azdata.SchemaCompareEndpointInfo, targetEndpointInfo: azdata.SchemaCompareEndpointInfo, taskExecutionMode: azdata.TaskExecutionMode, deploymentOptions: azdata.DeploymentOptions): Thenable<azdata.SchemaCompareResult> => {
-			let params: contracts.SchemaCompareParams = { sourceEndpointInfo: sourceEndpointInfo, targetEndpointInfo: targetEndpointInfo, taskExecutionMode: taskExecutionMode, deploymentOptions: deploymentOptions };
+			let params: contracts.SchemaCompareParams = { operationId: operationId, sourceEndpointInfo: sourceEndpointInfo, targetEndpointInfo: targetEndpointInfo, taskExecutionMode: taskExecutionMode, deploymentOptions: deploymentOptions };
 			return client.sendRequest(contracts.SchemaCompareRequest.type, params).then(
 				r => {
 					return r;
@@ -232,13 +232,27 @@ export class SchemaCompareServicesFeature extends SqlOpsFeature<undefined> {
 			);
 		};
 
+		let schemaCompareCancel = (operationId: string): Thenable<azdata.ResultStatus> => {
+			let params: contracts.SchemaCompareCancelParams = { operationId: operationId };
+			return client.sendRequest(contracts.SchemaCompareCancellationRequest.type, params).then(
+				r => {
+					return r;
+				},
+				e => {
+					client.logFailedRequest(contracts.SchemaCompareCancellationRequest.type, e);
+					return Promise.resolve(undefined);
+				}
+			);
+		};
+
 		return azdata.dataprotocol.registerSchemaCompareServicesProvider({
 			providerId: client.providerId,
 			schemaCompare,
 			schemaCompareGenerateScript,
 			schemaComparePublishChanges,
 			schemaCompareGetDefaultOptions,
-			schemaCompareIncludeExcludeNode
+			schemaCompareIncludeExcludeNode,
+			schemaCompareCancel
 		});
 	}
 }

extensions/schema-compare/src/media/stop-inverse.svg

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 23.0.4, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 16 16" style="enable-background:new 0 0 16 16;" xml:space="preserve">
+<style type="text/css">
+	.st0{fill:#4894FE;}
+</style>
+<title>SchemaCompare</title>
+<rect x="3" y="3" class="st0" width="10" height="10"/>
+</svg>

extensions/schema-compare/src/media/stop.svg

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 23.0.4, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 16 16" style="enable-background:new 0 0 16 16;" xml:space="preserve">
+<style type="text/css">
+	.st0{fill:#015CDA;}
+</style>
+<title>SchemaCompare</title>
+<rect x="3" y="3" class="st0" width="10" height="10"/>
+</svg>

extensions/schema-compare/src/schemaCompareResult.ts

@@ -12,6 +12,7 @@ import { SchemaCompareOptionsDialog } from './dialogs/schemaCompareOptionsDialog
 import { Telemetry } from './telemetry';
 import { getTelemetryErrorType, getEndpointName } from './utils';
 import { SchemaCompareDialog } from './dialogs/schemaCompareDialog';
+import { isNullOrUndefined } from 'util';
 const localize = nls.loadMessageBundle();
 const diffEditorTitle = localize('schemaCompare.CompareDetailsTitle', 'Compare Details');
 const applyConfirmation = localize('schemaCompare.ApplyConfirmation', 'Are you sure you want to update the target?');
@@ -38,12 +39,14 @@ export class SchemaCompareResult {
 	private sourceTargetFlexLayout: azdata.FlexContainer;
 	private switchButton: azdata.ButtonComponent;
 	private compareButton: azdata.ButtonComponent;
+	private cancelCompareButton: azdata.ButtonComponent;
 	private optionsButton: azdata.ButtonComponent;
 	private generateScriptButton: azdata.ButtonComponent;
 	private applyButton: azdata.ButtonComponent;
 	private selectSourceButton: azdata.ButtonComponent;
 	private selectTargetButton: azdata.ButtonComponent;
 	private SchemaCompareActionMap: Map<Number, string>;
+	private operationId: string;
 	private comparisonResult: azdata.SchemaCompareResult;
 	private sourceNameComponent: azdata.TableComponent;
 	private targetNameComponent: azdata.TableComponent;
@@ -112,6 +115,7 @@ export class SchemaCompareResult {
 
 			this.createSwitchButton(view);
 			this.createCompareButton(view);
+			this.createCancelButton(view);
 			this.createGenerateScriptButton(view);
 			this.createApplyButton(view);
 			this.createOptionsButton(view);
@@ -121,6 +125,8 @@ export class SchemaCompareResult {
 			let toolBar = view.modelBuilder.toolbarContainer();
 			toolBar.addToolbarItems([{
 				component: this.compareButton
+			}, {
+				component: this.cancelCompareButton
 			}, {
 				component: this.generateScriptButton
 			}, {
@@ -247,7 +253,11 @@ export class SchemaCompareResult {
 		}
 		Telemetry.sendTelemetryEvent('SchemaComparisonStarted');
 		const service = await SchemaCompareResult.getService('MSSQL');
-		this.comparisonResult = await service.schemaCompare(this.sourceEndpointInfo, this.targetEndpointInfo, azdata.TaskExecutionMode.execute, this.deploymentOptions);
+		if (!this.operationId) {
+			// create once per page
+			this.operationId = generateGuid();
+		}
+		this.comparisonResult = await service.schemaCompare(this.operationId, this.sourceEndpointInfo, this.targetEndpointInfo, azdata.TaskExecutionMode.execute, this.deploymentOptions);
 		if (!this.comparisonResult || !this.comparisonResult.success) {
 			Telemetry.sendTelemetryEventForError('SchemaComparisonFailed', {
 				'errorType': getTelemetryErrorType(this.comparisonResult.errorMessage),
@@ -314,6 +324,7 @@ export class SchemaCompareResult {
 		this.switchButton.enabled = true;
 		this.compareButton.enabled = true;
 		this.optionsButton.enabled = true;
+		this.cancelCompareButton.enabled = false;
 
 		if (this.comparisonResult.differences.length > 0) {
 			this.flexModel.addItem(this.splitView, { CSSStyles: { 'overflow': 'hidden' } });
@@ -372,7 +383,7 @@ export class SchemaCompareResult {
 	private saveExcludeState(rowState: azdata.ICheckboxCellActionEventArgs) {
 		if (rowState) {
 			let diff = this.comparisonResult.differences[rowState.row];
-			let key = diff.sourceValue ? diff.sourceValue : diff.targetValue;
+			let key = (diff.sourceValue && diff.sourceValue.length > 0) ? this.createName(diff.sourceValue) : this.createName(diff.targetValue);
 			if (key) {
 				if (!this.sourceTargetSwitched) {
 					this.originalSourceExcludes.delete(key);
@@ -403,7 +414,7 @@ export class SchemaCompareResult {
 	}
 
 	private shouldDiffBeIncluded(diff: azdata.DiffEntry): boolean {
-		let key = diff.sourceValue ? diff.sourceValue : diff.targetValue;
+		let key = (diff.sourceValue && diff.sourceValue.length > 0) ? this.createName(diff.sourceValue) : this.createName(diff.targetValue);
 		if (key) {
 			if (this.sourceTargetSwitched === true && this.originalTargetExcludes.has(key)) {
 				this.originalTargetExcludes[key] = diff;
@@ -423,9 +434,9 @@ export class SchemaCompareResult {
 		if (differences) {
 			differences.forEach(difference => {
 				if (difference.differenceType === azdata.SchemaDifferenceType.Object) {
-					if (difference.sourceValue !== null || difference.targetValue !== null) {
+					if ((difference.sourceValue !== null && difference.sourceValue.length > 0) || (difference.targetValue !== null && difference.targetValue.length > 0)) {
 						let state: boolean = this.shouldDiffBeIncluded(difference);
-						data.push([difference.name, difference.sourceValue, state, this.SchemaCompareActionMap[difference.updateAction], difference.targetValue]);
+						data.push([difference.name, this.createName(difference.sourceValue), state, this.SchemaCompareActionMap[difference.updateAction], this.createName(difference.targetValue)]);
 					}
 				}
 			});
@@ -434,6 +445,13 @@ export class SchemaCompareResult {
 		return data;
 	}
 
+	private createName(nameParts: string[]): string {
+		if (isNullOrUndefined(nameParts) || nameParts.length === 0) {
+			return '';
+		}
+		return nameParts.join('.');
+	}
+
 	private getFormattedScript(diffEntry: azdata.DiffEntry, getSourceScript: boolean): string {
 		// if there is no entry, the script has to be \n because an empty string shows up as a difference but \n doesn't
 		if ((getSourceScript && diffEntry.sourceScript === null)
@@ -497,6 +515,54 @@ export class SchemaCompareResult {
 		});
 	}
 
+	private createCancelButton(view: azdata.ModelView): void {
+		this.cancelCompareButton = view.modelBuilder.button().withProperties({
+			label: localize('schemaCompare.cancelCompareButton', 'Stop'),
+			iconPath: {
+				light: path.join(__dirname, 'media', 'stop.svg'),
+				dark: path.join(__dirname, 'media', 'stop-inverse.svg')
+			},
+			title: localize('schemaCompare.cancelCompareButtonTitle', 'Stop')
+		}).component();
+
+		this.cancelCompareButton.onDidClick(async (click) => {
+			await this.cancelCompare();
+		});
+	}
+
+	private async cancelCompare() {
+
+		Telemetry.sendTelemetryEvent('SchemaCompareCancelStarted', {
+			'startTime:': Date.now().toString(),
+			'operationId': this.operationId
+		});
+
+		// clean the pane
+		this.flexModel.removeItem(this.loader);
+		this.flexModel.removeItem(this.waitText);
+		this.flexModel.addItem(this.startText, { CSSStyles: { 'margin': 'auto' } });
+		this.resetButtons(true);
+
+		// cancel compare
+		if (this.operationId) {
+			const service = await SchemaCompareResult.getService('MSSQL');
+			const result = await service.schemaCompareCancel(this.operationId);
+
+			if (!result || !result.success) {
+				Telemetry.sendTelemetryEvent('SchemaCompareCancelFailed', {
+					'errorType': getTelemetryErrorType(result.errorMessage),
+					'operationId': this.operationId
+				});
+				vscode.window.showErrorMessage(
+					localize('schemaCompare.cancelErrorMessage', "Cancel schema compare failed: '{0}'", (result && result.errorMessage) ? result.errorMessage : 'Unknown'));
+			}
+			Telemetry.sendTelemetryEvent('SchemaCompareCancelEnded', {
+				'endTime:': Date.now().toString(),
+				'operationId': this.operationId
+			});
+		}
+	}
+
 	private createGenerateScriptButton(view: azdata.ModelView): void {
 		this.generateScriptButton = view.modelBuilder.button().withProperties({
 			label: localize('schemaCompare.generateScriptButton', 'Generate script'),
@@ -606,11 +672,13 @@ export class SchemaCompareResult {
 			this.compareButton.enabled = true;
 			this.optionsButton.enabled = true;
 			this.switchButton.enabled = true;
+			this.cancelCompareButton.enabled = false;
 		}
 		else {
 			this.compareButton.enabled = false;
 			this.optionsButton.enabled = false;
 			this.switchButton.enabled = false;
+			this.cancelCompareButton.enabled = true;
 		}
 		this.generateScriptButton.enabled = false;
 		this.applyButton.enabled = false;
@@ -714,3 +782,29 @@ export class SchemaCompareResult {
 		this.deploymentOptions = result.defaultDeploymentOptions;
 	}
 }
+
+// Borrowed as is from other extensions
+// TODO : figure out if any inbuilt alternative is available
+export function generateGuid(): string {
+	let hexValues: string[] = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'];
+	// c.f. rfc4122 (UUID version 4 = xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx)
+	let oct: string = '';
+	let tmp: number;
+	/* tslint:disable:no-bitwise */
+	for (let a: number = 0; a < 4; a++) {
+		tmp = (4294967296 * Math.random()) | 0;
+		oct += hexValues[tmp & 0xF] +
+			hexValues[tmp >> 4 & 0xF] +
+			hexValues[tmp >> 8 & 0xF] +
+			hexValues[tmp >> 12 & 0xF] +
+			hexValues[tmp >> 16 & 0xF] +
+			hexValues[tmp >> 20 & 0xF] +
+			hexValues[tmp >> 24 & 0xF] +
+			hexValues[tmp >> 28 & 0xF];
+	}
+
+	// 'Set the two most significant bits (bits 6 and 7) of the clock_seq_hi_and_reserved to zero and one, respectively'
+	let clockSequenceHi: string = hexValues[8 + (Math.random() * 4) | 0];
+	return oct.substr(0, 8) + '-' + oct.substr(9, 4) + '-4' + oct.substr(13, 3) + '-' + clockSequenceHi + oct.substr(16, 3) + '-' + oct.substr(19, 12);
+	/* tslint:enable:no-bitwise */
+}

extensions/schema-compare/src/test/schemaCompare.test.ts

@@ -69,7 +69,7 @@ describe('SchemaCompareResult.start', function (): void {
 
 		let result = new SchemaCompareResult();
 		await result.start(null);
-		let promise = new Promise(resolve => setTimeout(resolve, 3000)); // to ensure comparision result view is initialized
+		let promise = new Promise(resolve => setTimeout(resolve, 5000)); // to ensure comparison result view is initialized
 		await promise;
 
 		should(result.getComparisonResult() === undefined);

extensions/schema-compare/src/test/testSchemaCompareService.ts

@@ -27,7 +27,7 @@ export class SchemaCompareTestService implements azdata.SchemaCompareServicesPro
 		throw new Error('Method not implemented.');
 	}
 
-	schemaCompare(sourceEndpointInfo: azdata.SchemaCompareEndpointInfo, targetEndpointInfo: azdata.SchemaCompareEndpointInfo, taskExecutionMode: azdata.TaskExecutionMode): Thenable<azdata.SchemaCompareResult> {
+	schemaCompare(operationId: string, sourceEndpointInfo: azdata.SchemaCompareEndpointInfo, targetEndpointInfo: azdata.SchemaCompareEndpointInfo, taskExecutionMode: azdata.TaskExecutionMode): Thenable<azdata.SchemaCompareResult> {
 		let result: azdata.SchemaCompareResult = {
 			operationId: this.testOperationId,
 			areEqual: true,
@@ -39,7 +39,11 @@ export class SchemaCompareTestService implements azdata.SchemaCompareServicesPro
 		return Promise.resolve(result);
 	}
 
-	schemaCompareGenerateScript(operationId: string, targetServerName: string, targetDatabaseName: string, taskExecutionMode: azdata.TaskExecutionMode): Thenable<azdata.DacFxResult> {
+	schemaCompareGenerateScript(operationId: string, targetServerName: string, targetDatabaseName: string, taskExecutionMode: azdata.TaskExecutionMode): Thenable<azdata.ResultStatus> {
+		return undefined;
+	}
+
+	schemaCompareCancel(operationId: string): Thenable<azdata.ResultStatus> {
 		return undefined;
 	}
 

src/sql/azdata.proposed.d.ts

@@ -1740,12 +1740,18 @@ declare module 'azdata' {
 		differences: DiffEntry[];
 	}
 
+	export interface SchemaCompareCompletionResult extends ResultStatus {
+		operationId: string;
+		areEqual: boolean;
+		differences: DiffEntry[];
+	}
+
 	export interface DiffEntry {
 		updateAction: SchemaUpdateAction;
 		differenceType: SchemaDifferenceType;
 		name: string;
-		sourceValue: string;
+		sourceValue: string[];
-		targetValue: string;
+		targetValue: string[];
 		parent: DiffEntry;
 		children: DiffEntry[];
 		sourceScript: string;
@@ -1930,11 +1936,12 @@ declare module 'azdata' {
 	}
 
 	export interface SchemaCompareServicesProvider extends DataProvider {
-		schemaCompare(sourceEndpointInfo: SchemaCompareEndpointInfo, targetEndpointInfo: SchemaCompareEndpointInfo, taskExecutionMode: TaskExecutionMode, deploymentOptions: DeploymentOptions): Thenable<SchemaCompareResult>;
+		schemaCompare(operationId: string, sourceEndpointInfo: SchemaCompareEndpointInfo, targetEndpointInfo: SchemaCompareEndpointInfo, taskExecutionMode: TaskExecutionMode, deploymentOptions: DeploymentOptions): Thenable<SchemaCompareResult>;
 		schemaCompareGenerateScript(operationId: string, targetServerName: string, targetDatabaseName: string, taskExecutionMode: TaskExecutionMode): Thenable<ResultStatus>;
 		schemaComparePublishChanges(operationId: string, targetServerName: string, targetDatabaseName: string, taskExecutionMode: TaskExecutionMode): Thenable<ResultStatus>;
 		schemaCompareGetDefaultOptions(): Thenable<SchemaCompareOptionsResult>;
 		schemaCompareIncludeExcludeNode(operationId: string, diffEntry: DiffEntry, IncludeRequest: boolean, taskExecutionMode: TaskExecutionMode): Thenable<ResultStatus>;
+		schemaCompareCancel(operationId: string): Thenable<ResultStatus>;
 	}
 
 	// Security service interfaces ------------------------------------------------------------------------

src/sql/platform/schemaCompare/common/schemaCompareService.ts

@@ -15,11 +15,12 @@ export interface ISchemaCompareService {
 	_serviceBrand: any;
 
 	registerProvider(providerId: string, provider: azdata.SchemaCompareServicesProvider): void;
-	schemaCompare(sourceEndpointInfo: azdata.SchemaCompareEndpointInfo, targetEndpointInfo: azdata.SchemaCompareEndpointInfo, taskExecutionMode: azdata.TaskExecutionMode, deploymentOptions: azdata.DeploymentOptions): void;
+	schemaCompare(operationId: string, sourceEndpointInfo: azdata.SchemaCompareEndpointInfo, targetEndpointInfo: azdata.SchemaCompareEndpointInfo, taskExecutionMode: azdata.TaskExecutionMode, deploymentOptions: azdata.DeploymentOptions): void;
 	schemaCompareGenerateScript(operationId: string, targetServerName: string, targetDatabaseName: string, taskExecutionMode: azdata.TaskExecutionMode): void;
 	schemaComparePublishChanges(operationId: string, targetServerName: string, targetDatabaseName: string, taskExecutionMode: azdata.TaskExecutionMode): void;
 	schemaCompareGetDefaultOptions(): void;
 	schemaCompareIncludeExcludeNode(operationId: string, diffEntry: azdata.DiffEntry, includeRequest: boolean, taskExecutionMode: azdata.TaskExecutionMode): void;
+	schemaCompareCancel(operationId: string): void;
 }
 
 export class SchemaCompareService implements ISchemaCompareService {
@@ -32,9 +33,9 @@ export class SchemaCompareService implements ISchemaCompareService {
 		this._providers[providerId] = provider;
 	}
 
-	schemaCompare(sourceEndpointInfo: azdata.SchemaCompareEndpointInfo, targetEndpointInfo: azdata.SchemaCompareEndpointInfo, taskExecutionMode: azdata.TaskExecutionMode, deploymentOptions: azdata.DeploymentOptions): Thenable<azdata.SchemaCompareResult> {
+	schemaCompare(operationId: string, sourceEndpointInfo: azdata.SchemaCompareEndpointInfo, targetEndpointInfo: azdata.SchemaCompareEndpointInfo, taskExecutionMode: azdata.TaskExecutionMode, deploymentOptions: azdata.DeploymentOptions): Thenable<azdata.SchemaCompareResult> {
 		return this._runAction(sourceEndpointInfo.ownerUri, (runner) => {
-			return runner.schemaCompare(sourceEndpointInfo, targetEndpointInfo, taskExecutionMode, deploymentOptions);
+			return runner.schemaCompare(operationId, sourceEndpointInfo, targetEndpointInfo, taskExecutionMode, deploymentOptions);
 		});
 	}
 
@@ -62,6 +63,12 @@ export class SchemaCompareService implements ISchemaCompareService {
 		});
 	}
 
+	schemaCompareCancel(operationId: string): Thenable<azdata.ResultStatus> {
+		return this._runAction('', (runner) => {
+			return runner.schemaCompareCancel(operationId);
+		});
+	}
+
 	private _runAction<T>(uri: string, action: (handler: azdata.SchemaCompareServicesProvider) => Thenable<T>): Thenable<T> {
 		let providerId: string = this._connectionService.getProviderIdFromUri(uri);
 

src/sql/workbench/api/node/mainThreadDataProtocol.ts

@@ -470,8 +470,8 @@ export class MainThreadDataProtocol implements MainThreadDataProtocolShape {
 	public $registerSchemaCompareServicesProvider(providerId: string, handle: number): Promise<any> {
 		const self = this;
 		this._schemaCompareService.registerProvider(providerId, <azdata.SchemaCompareServicesProvider>{
-			schemaCompare(sourceEndpointInfo: azdata.SchemaCompareEndpointInfo, targetEndpointInfo: azdata.SchemaCompareEndpointInfo, taskExecutionMode: azdata.TaskExecutionMode, schemaComapareOptions: azdata.DeploymentOptions): Thenable<azdata.SchemaCompareResult> {
+			schemaCompare(operationId: string, sourceEndpointInfo: azdata.SchemaCompareEndpointInfo, targetEndpointInfo: azdata.SchemaCompareEndpointInfo, taskExecutionMode: azdata.TaskExecutionMode, schemaComapareOptions: azdata.DeploymentOptions): Thenable<azdata.SchemaCompareResult> {
-				return self._proxy.$schemaCompare(handle, sourceEndpointInfo, targetEndpointInfo, taskExecutionMode, schemaComapareOptions);
+				return self._proxy.$schemaCompare(handle, operationId, sourceEndpointInfo, targetEndpointInfo, taskExecutionMode, schemaComapareOptions);
 			},
 			schemaCompareGenerateScript(operationId: string, targetServerName: string, targetDatabaseName: string, taskExecutionMode: azdata.TaskExecutionMode): Thenable<azdata.ResultStatus> {
 				return self._proxy.$schemaCompareGenerateScript(handle, operationId, targetServerName, targetDatabaseName, taskExecutionMode);
@@ -484,6 +484,9 @@ export class MainThreadDataProtocol implements MainThreadDataProtocolShape {
 			},
 			schemaCompareIncludeExcludeNode(operationId: string, diffEntry: azdata.DiffEntry, includeRequest: boolean, taskExecutionMode: azdata.TaskExecutionMode): Thenable<azdata.ResultStatus> {
 				return self._proxy.$schemaCompareIncludeExcludeNode(handle, operationId, diffEntry, includeRequest, taskExecutionMode);
+			},
+			schemaCompareCancel(operationId: string): Thenable<azdata.ResultStatus> {
+				return self._proxy.$schemaCompareCancel(handle, operationId);
 			}
 		});
 

src/sql/workbench/api/node/sqlExtHost.protocol.ts

@@ -465,7 +465,7 @@ export abstract class ExtHostDataProtocolShape {
 	/**
 	 * Schema compare
 	 */
-	$schemaCompare(handle: number, sourceEndpointInfo: azdata.SchemaCompareEndpointInfo, targetEndpointInfo: azdata.SchemaCompareEndpointInfo, taskExecutionMode: azdata.TaskExecutionMode, schemaComapareOptions: azdata.DeploymentOptions): Thenable<azdata.SchemaCompareResult> { throw ni(); }
+	$schemaCompare(handle: number, operationId: string, sourceEndpointInfo: azdata.SchemaCompareEndpointInfo, targetEndpointInfo: azdata.SchemaCompareEndpointInfo, taskExecutionMode: azdata.TaskExecutionMode, schemaComapareOptions: azdata.DeploymentOptions): Thenable<azdata.SchemaCompareResult> { throw ni(); }
 
 	/**
 	 * Schema compare generate script
@@ -487,6 +487,12 @@ export abstract class ExtHostDataProtocolShape {
 	 * Schema compare Include node
 	 */
 	$schemaCompareIncludeExcludeNode(handle: number, operationId: string, diffEntry: azdata.DiffEntry, includeRequest: boolean, taskExecutionMode: azdata.TaskExecutionMode): Thenable<azdata.ResultStatus> { throw ni(); }
+
+	/**
+	 * Schema compare cancel
+	 */
+	$schemaCompareCancel(handle: number, operationId: string): Thenable<azdata.ResultStatus> { throw ni(); }
+
 }
 
 /**